It does not surprise me that ITunes is becoming so popular, but not for music instead it is being used by high school students in America for TV: article here.
I must admit that if I think about I get almost all my TV media from the internet.
The BBC provides an excellent service as does channel four. Then there all the RSS feeds that provide enough content in reading, video, and sound. In fact the audio feeds from Mike Southon are very interesting for sales training.
Nearer to home we have a our own Local Long Tale TV who are really showing us the future http://www.longtaletv.com along with several American startups.